Originally Posted by JohnBradley

2 reasons-

Ignition Timing

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Because of where it makes peak torque. Torque x rpm/5252 = hp, so after 5252rpm the torque will drop and the horsepower goes up. Since this makes peak power at 8,000 when we look at the math (and dyno sheet for that matter) we see it makes 321 ft lbs.

Your friends car is probably on a Green or something like that? It would spool 1000rpm sooner or more, make peak torque in the 4,000 range and peak power maybe mid 6,000r?

Let's say 6500 for peak power. This means at 6500 it makes 323 ft lbs there (for instance) where this car is making 349ish ft lbs and is still climbing in power toward redline.

aaron